diff --git a/ap/libc/glibc/glibc-2.23/libio/ftello.c b/ap/libc/glibc/glibc-2.23/libio/ftello.c
new file mode 100644
index 0000000..7122815
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/libio/ftello.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 1993-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.
+
+   As a special exception, if you link the code in this file with
+   files compiled with a GNU compiler to produce an executable,
+   that does not cause the resulting executable to be covered by
+   the GNU Lesser General Public License.  This exception does not
+   however invalidate any other reasons why the executable file
+   might be covered by the GNU Lesser General Public License.
+   This exception applies to code released by its copyright holders
+   in files containing the exception.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <libioP.h>
+#include <errno.h>
+
+
+off_t
+__ftello (_IO_FILE *fp)
+{
+  _IO_off64_t pos;
+  CHECK_FILE (fp, -1L);
+  _IO_acquire_lock (fp);
+  pos = _IO_seekoff_unlocked (fp, 0, _IO_seek_cur, 0);
+  if (_IO_in_backup (fp) && pos != _IO_pos_BAD)
+    {
+      if (fp->_mode <= 0)
+	pos -= fp->_IO_save_end - fp->_IO_save_base;
+    }
+  _IO_release_lock (fp);
+  if (pos == _IO_pos_BAD)
+    {
+#ifdef EIO
+      if (errno == 0)
+	__set_errno (EIO);
+#endif
+      return -1L;
+    }
+  if ((_IO_off64_t) (off_t) pos != pos)
+    {
+#ifdef EOVERFLOW
+      __set_errno (EOVERFLOW);
+#endif
+      return -1L;
+    }
+  return pos;
+}
+libc_hidden_def (__ftello)
+weak_alias (__ftello, ftello)
+
+#ifdef __OFF_T_MATCHES_OFF64_T
+weak_alias (__ftello, ftello64)
+#endif